Posted by help please on Monday, May 7, 2012 at 2:09pm.
Conservation of momentum, and energy applies.
m*250= 32m*Vo+mVp
where Vo is the velocity of the oxygen molecule, and Vp is the velocity of the proton.
Vp= (250-32)Vo
Now, energy.
1/2 250^2=1/2 32 Vo^2+1/2 Vp^2
put the experession for Vp above into that, and solve for Vo
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